An aero-hydrodynamic analogy is used to construct a description of the formation of wavy interfaces during explosive bonding. A von Karman vortex street in the wake of the reentrant jet formed at the collision point of the parent and flyer plates yields the required interface structure. The reentrant jet is considered as a transverse obstacle behind which the main flyer and parent streams join and form a periodic wake. The fluid flow analogy is amenable to description in terms of Reynolds numbers. A cylindrical parent plate technique is employed to obtain a spectrum of interface configurations as a function of collision point velocity. The results establish a characteristic range of values of the Reynolds number for the onset of wave formation and the range over which wave formation occurs (2≤NRe≤10). Grain deformation adjacent to the direct bond are interpreted in terms of a laminar flow model.